NEMA23 Direct Drive Extruder v2

Update to previous desing giving more strength and better filament path

3D printer parts and enhancements

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Very similar to previous design (  but after a good number of iterations and tweaks the design is much better now. I have been able to extrude ninjaflex through a bowden tube (as short as possible).
I recently have switched to 4mm compression fittings for bowden tube attachment. This makes dealing with jams or stuck filament much easier and doesn't seem to fail like quick-connect fittings eventually do.

There are a variety of motor attachments. I have a custom one for each of my printers (SpiderBot, RoStockMAXX, and RoStockFAZZ) with NPT or M8 fittings for each.

Materials and methods

1 - NEMA23 Motor (preferably with double shaft)
4 - M5 x 35mm bolts
4 - M5 locknuts
1 - M5 thumbturn for allen head
1 - 608 skate bearing
1- 8mm x18mm metal shaft
1 - 1/4" x 1.25" spring
1 - Hobbed Pulley (

1 - 1/8" NPT quick connect fitting
thin 1/8" NPT nut


1 - M8 male screw to 4mm compression fitting (
1 - thin M8 nut



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Mini 3davatarPaulo Rodrigues added this to the 3D Printer Extruders collection ago
C46ad9bb6ee16c259628372f7d8fcd53?default=blank&size=40mikefazz published this design ago